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G. W. HALL, Propeller f-orflanal-Boats'.

No. 227,245. Patented May 4,1880.

INVENTO WITNESSES ATTORNEYS.

2 UNITED STATES PATENT OFFICE.

GORDON W. HALL, OF HAVANA, NEW YORK, ASSIGNOR TO HIMSELF AND I ALBERT O. WHITTEMORE, OF SAME PLACE.

PROPELLER FOR CANAL-BOATS.

SPECIFICATION forming part of Letters Patent No. 227,245, dated May 4, 1880.

' Application filed February 17, 1880.

To all whom t't may concern Be it known that I, GORDON W. HALL, of Havana, in the county of Schuyler and State of New York, have invented a new and useful Improvement in Propellers for Canal-Boats,

of which the following is a specification.

The invention consists in a propeller having a hollow portion arranged to turn in the dead water under the stern of boat and connected :0 by a pipe with a condenser, as hereinafter described. These featnres will be more particularly described with reference to the accompanying drawings, forming part of this specification, wherein- I Figure 1 is a rear elevation of a boat fitted with my improved mechanism. Fig. 2 is a vertical longitudinal section of the stern portion of the boat.

Similar letters of reference indicate corre- 2o sponding parts.

A is the boat. a is the propeller-shaft fitted in the stern, and B is the propeller-wheel upon the shaft (0.

The wheel 13 consists of the central portion,

7), formed with the hub c and fitted with the blades (2. The portion 1) is hollow and is made in the shape of a frustum of a conev or a cylinder, with the end that is placed outward closed.

The stern of the boat A is finished offsquarely, and the frustum b is of such a diameter that when conical its tapering sides are continuations of the lines of the boat, so that the portion 1) turns in the dead water, while the blades d project beyond the lines of the boat 3 5 into the solid water, where they have the greatest possible effect.

0 represents the surface-condenser of the engine, the discharge-pipe c of which extends to the hollow portion 1) of the wheel near the bottom.

The wheel B, by its revolution, will tend to create a vacuum in the part b, which will suck the water from the condenser through the pipe 6, and a circulation will thus bekept up in the 5 condenser without the use of a special pump for the purpose, and the power to drive the pump will be saved.

This construction furnishes a propeller especially suitable for canal-boats of ordinary construction, which will give the most effective application of the power used.

Havingthus described my invention, I claim as new and desire to secure by Letters Patent The combination, on a canal-boat, of the hollow propeller B b and the condenser O of the engine, the two connected by a pipe, 0, as and for the purpose specified.

GORDON W. HALL.

Witnesses:

E. A. DE Win, A. G. SAUNDERS. 

